Question

Ok, so this problem has no examples or anything, and nothingtalksabout it in the previous chapters. Could anyone help me? Ihavetried doing it on my own and looking back on work but I can'tseemto figure it out.

This is the problem: Remote controlled model boats arepoweredby burning methanol or a racing mixture of 80% methanol and20%nitromethane by mass. Te standard enthalpies of formation ofliquidmethanol and nitromethane are, respectively, -283.6 kJ/moland-74.78 kJ/mol. a) Draw structural diagrams for all reactantsandproducts. b) Calculate the percentage change in energyoutputachieved by using a racing mixture. Our teacher gave us thisaswell: CH3NO2 + O2 --> CO2 + 3/2 H2O + NO So I'm guessingthatwould be the equation for nitromethane...but if I have to doaformation equation shouldn't it be only 1 equation? And so Ineedto make a second one for the combustion of methanol? If Icanunderstand that, I'm sure I can do the rest no problem, but thisiswhere I am stuck.